Australia is recovering from one of its worst wildfire seasons ever, which occurred during the nation's second-hottest summer on record. Experts believe this year's wildfire season was worsened by climate change. But in another sad blow for the Australian environment, it has now been confirmed that once again climate change has caused damage to one of its greatest natural wonders --- the Great Barrier Reef.
  The Great Barrier Reef is the world's largest coral reef system,home to some 600 species of coral. But a recent study has confirmed scientists' worst fears,concluding that the reef is experiencing its third large-scale bleaching（白化）event in five years. Coral bleaching is the direct result of warming sea temperatures,which causes corals to become stressed. In this situation,coral drives out the algae（海藻）that live within it, which is responsible for its bright color.
  Terry Hughes from James Cook University led a team of researchers to assess the degree of the coral bleaching across the reef. Hughes said,"We surveyed 1，036 reefs from the air during the last two weeks. For the first time, severe bleaching has struck in all the regions of the Great Barrier Reef."
  But the coral has not died, and there is the possibility of a full recovery. So in order to protect the Great Barrier Reef for years to come, what is the solution？
  Dr. Mark Eakin, who managed a Coral Reef Watch program, said, "This is the third widespread, severe coral bleaching in less than five years. As long as we continue to give out CO2，and other greenhouse gases into the air, corals will continue to bleach and die. Local efforts to reduce pollution on the reef and to recover reefs piecemeal help keep corals alive. If we want to save the Great Barrier Reef and other reefs around the world, we have to move away from fossil fuels, such as coal and oil, as quickly as possible."



What can we learn about this year's wildfire season？ ______

A. It's been the worst in Australian history.
B. It happened in the hottest summer.
C. It became worse due to climate change.
D. It damaged the Great Barrier Reef.

Which is the reason for coral bleaching？ ______

A. The worst wildfire season.
B. Rising sea temperatures.
C. Stressful sea environment.
D. No living algae in the sea.

What's the writer's attitude to a full recovery？ ______

A. Positive.
B. Unclear.
C. Negative.
D. Indifferent.

What can be inferred from Dr. Mark Eakin's words？ ______

A. Coral bleaching becomes less severe.
B. More greenhouse gases are into the air.
C. Local efforts can make a difference.
D. We should use coal and oil like before.